Bloom.Publish.SHRP_PupilBookExtension.PlaceThumbnailOrders C# (CSharp) Method

        private void PlaceThumbnailOrders(object sender, DoWorkEventArgs doWorkEventArgs)
        {
            //var state = (ProgressState)doWorkEventArgs.Argument;

            var exportFolder = Path.Combine(BookFolder, "Thumbnails");

            //state.StatusLabel = "Creating thumbnail folder at " + exportFolder;
            if (Directory.Exists(exportFolder))
            {
                //state.StatusLabel = "Deleting existing thumbnail directory";
                SIL.IO.RobustIO.DeleteDirectory(exportFolder, true);
                Thread.Sleep(1000); //let any open windows explorers deal with this before we move on
            }
            Directory.CreateDirectory(exportFolder);
            //state.StatusLabel = "Creating Thumbnail Directory";
            Thread.Sleep(1000); //let any open windows explorers deal with this before we move on

            //state.StatusLabel = "Ordering page thumbnails";

            foreach (var pageDom in GetPageDoms())
            {
                if (null != pageDom.SelectSingleNode("//div[contains(@class,'oddPage') or contains(@class,'evenPage') or contains(@class,'leftPage')  or contains(@class,'rightPage') or contains(@class,'primerPage')]"))
                {
            //					if(null != pageDom.SelectSingleNode("//div[contains(@class,'bloom-frontMatter')]"))
            //						continue; //c2 p2 had a term intro page with the class "rigthPage" which gives the prior query a false positive

                    const double kproportionOfWidthToHeightForB5 = 0.708;
                    const int heightInPixels = 700;
                    const int widthInPixels = (int) (heightInPixels*kproportionOfWidthToHeightForB5);

                    GetThumbnailAsync(widthInPixels, heightInPixels, pageDom, image => ThumbnailReady(exportFolder, pageDom, image),
                        error => HandleThumbnailerError(pageDom, error));
                }
            }
            //this folder won't be fully populated yet, but as they watch it will fill up
            Process.Start("explorer.exe", " \"" + exportFolder + "\"");

            //state.WriteToLog("Now sit tight and wait for the thumbnail directory to stop filling up.");
        }